﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WF01
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: 这行代码将数据加载到表“dataSet1.student”中。您可以根据需要移动或删除它。
          


            var stusql = "select * from students ";
            var dt = DBhelper.GetDataTable(stusql);

            dataGridView1.DataSource = dt;
            dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
            dataGridView1.ReadOnly = true;
            dataGridView1.AllowUserToAddRows = false;
        }
//修改
        private void button3_Click(object sender, EventArgs e)
        {
            if (dataGridView1.SelectedRows.Count > 0)
            {
                var id = (int)dataGridView1.SelectedRows[0].Cells["id"].Value;
                var name = dataGridView1.SelectedRows[0].Cells["name"].Value;
                var age = dataGridView1.SelectedRows[0].Cells["Age"].Value;
                var score = dataGridView1.SelectedRows[0].Cells["Score"].Value;
                editform editform = new editform();
                var res = editform.ShowDialog();
         
                if (res==DialogResult.Yes)
                {
                    var Studentsql = "select * from Students";
                    var dt = DBhelper.GetDataTable(studentsql);
                    dataGridView1.DataSource = dt;
                }
                else
                {
                    MessageBox.Show("No");
                }

            }
            else
            {
                MessageBox.Show("请选择要修改的数据。");
            }
        }
//查
        private void button1_Click(object sender, EventArgs e)
        {
            var name=textBox1.Text;
            var sql= string.Format("select *from students  where name like '%{0}%'",name);
            var dt = DBhelper.GetDataTable(sql);
            dataGridView1.DataSource = dt;

        }
       
        //添加
        private void button2_Click(object sender, EventArgs e)
        {
            editform editform= new editform();
         
            var res = editform.ShowDialog();

            if (res == DialogResult.Yes)
            {
                var sql = "select * from Students";

                var dt = DBhelper.GetDataTable(sql);
                dataGridView1.DataSource = dt;
            }
            else
            {
                MessageBox.Show("No");
            }
        }

       
//删除
        private void button4_Click(object sender, EventArgs e)
        {
            if (dataGridView1.SelectedRows.Count > 0)
            {

                var Id = (int)dataGridView1.SelectedRows[0].Cells["Id"].Value;
                var sql = string.Format("delete from Students where Id={0}", Id);
                var res = DBhelper.addorupdate(sql);

                if (res == 1)
                {
                    MessageBox.Show("删除成功!");
                     var Stu = "select * from Students";
                     var dt = DBhelper.GetDataTable(Stu);
                    dataGridView1.DataSource = dt;
                }
                else
                {
                    MessageBox.Show("删除失败！");
                }
                 }
     


                

               
        }

        public string studentsql { get; set; }
    }
}
 